Shoe sewing machine



Dec. 24, 1940.

s. A. WENNERLUND HOE SEWING MACHINE Filed April 1, 1939 T .9 v M 9 z ,4; 4 g 6 6a Patented Dec. 24, 1940 UNITED STATES PATENT OFFICE Application April 1, 1939, Serial No. 265,502 In Sweden April 25, 1938 3 Claims.

The present invention relates to shoe sewing machines and in particular to machines for attaching the sole to the upper leather by means of a welt sewn round the edge of the sole.

It is the primary object of the invention to provide means for cutting the adjoining ends of the welt attached to the sole in such a manner that the joint between the ends of the welt will be inclined with respect to the plane of the sole and that said ends will be located closely adjacent to each other in overlapping relation, whereby to render possible an uninterrupted attachment by sewing even the very ends of the welt on the sole. A further object of the invention is to provide means for putting the cutter into operation at the proper moment so as to avoid the formation of substantial clearance between the abutting ends of the welt.

These objects are attained by mechanism illustrated in the accompanying drawing, in which:

Fig. 1 is a partly sectional View of the improved cutting device, showing its operative position relative to parts associated therewith;

Fig. 2 is a plan view of the cutting device;

Fig. 3 shows part of the cutting device as viewed from below;

Fig. 4 shows part of the cutting device a viewed in Fig. 1; and

Fig. 5 is a section showing the joint of the welt in the final position.

Similar numerals refer to throughout the several views.

In the embodiment of the invention illustrated, a knife 8 is formed at one end of a support I which may be of any suitable type known in the art. The knife is bevelled so as to extend slightly downwards and to form a sharp edge 9. The support I has a portion la, adapted to be secured to the sewing machine. Numeral 2 denotes the portion of the support against which the shoe bears during the operation. 3 indicates a slot through which the needle 4 and the awl (not shown) reciprocate. At the forward end of the portion 2 there is provided a guide opening 5 for the welt 6. The welt is further guided by means of a lateral projection I located on one side of the slot 3 and extending closely to the opening 5.

As will be seen from Fig. 1, the edge 9 is directed such that the welt 6 which is continuously fed from a suitable welt supply (not shown) moves against the edge 9, as indicated by the arrow p. In Fig. 1, the sole N, the turned-in portion H of the upper leather, and the welt 6 are shown in section, numeral 6a indicating the end of the welt, which is first attached to the sole.

The knife 8 is located between the welt 6 and the sole 10 when the latter is in working position.

similar parts means for timing the upward movement of the finger, for instance in response to the position of the edge of the end 6a of the welt. Normally, the finger I2 is kept in its neutral lower position by means of a spring IB inserted between an abutment I! connected with a stationary part of the machine and a collar l8 integral with the finger.

Due to the movement of the welt in the direction indicated by the arrow p, the end cut by the knife will be tapered in such a way that the ends of the welt will overlap each other, as shown in Fig. 5, without forming any irregularity, such as substantial clearance or projecting portions.

The invention is not limited to the specific embodiment shown in the drawing. Obviously, the knife may be directly connected to the machine so as to avoid the support I. Further, the knife may be pivotally mounted on the support or on the machine in a manner such that it can be turned into and out of the cutting position.

What I claim is:

1. In a shoe sewing machine, means for sewing a welt onto the sole of a shoe, a knife rigidly connected to said machine and arranged to cut off the ends of said welt, and means for guiding said welt into sewing position, the edge of said knife being arranged to be located during the sewing operation between said sole and said welt, and being directed opposite to the direction of movement of said welt.

2. In a shoe sewing machine, means for sewing a welt onto the sole of a shoe, a knife rigidly connected to said machine and arranged to cut off the ends of said welt, means for guiding said welt into sewing position, and means for moving said welt into cutting position, the edge of said knife being directed opposite to the direction of movement of said welt.

3. In a shoe sewing machine, means for sewing a welt onto the sole of a shoe, a knife rigidly connected to said machine and arranged to cut oii the ends of said welt, means for guiding said welt into sewing position, and means for turning said welt round the edge of said knife, said edge being directed opposite to the direction of movement of said welt.

SIGFRID AMANDUS WENNERLUND. 

